DE10305812A1 - High pressure cleaning unit, to deliver a fluid, has a high pressure liquid-cooled pump embedded in a filling material in a housing fitted with supply lines - Google Patents

Abstract

The high pressure cleaning unit (10), to deliver fluid, has liquid-cooled high pressure pump assembly (14) within housing (12). The housing has supply lines (16,20,26) which deliver fluid for pumping and coolant. The pump assembly is embedded within filling material (42) in positive fit. The filling material is encapsulated against exterior within a shell of plastics or a woven fabric or metal. The high pressure cleaning unit (10), to deliver a fluid, has a liquid-cooled high pressure pump assembly (14) within a housing (12). The housing has supply lines (16,20,26) which deliver the fluid for pumping and the coolant. The pump assembly is embedded within filling material (42) in a positive fit. The filling material is encapsulated against the exterior within a shell of plastics or a woven fabric or metal, and the filling material forms the housing wholly or partially. The pump has an electromotor (24) powered by mains electricity, or it works with a fuel cell and/or battery, or is driven by an internal combustion engine.

Description

The invention relates to a conveyor for Promote a fluid according to the im Preamble of claim 1 specified type.

conveyors are in different versions known, for example as a compressor, pump, suction device or the like and have one in a housing arranged conveyor unit on. The conveyor unit promotes fluid, like gaseous Media, for example air, or liquid media, such as water or the like. The known conveyors are by internal combustion engines, electric motors, hydraulic motors or air motors driven.

Problematic with these conveyors is that, among other things, during the funding process high noise emission and strong heat development occurs. To the one is trying to encapsulate the sound emission by appropriate training of the conveyor unit surrounding housing the conveyor to manage. This is opposed to the fact that the heat that during the conveying process occurs, dissipated must become. That is why it is known to only use partial areas of the conveyor to encapsulate and other, especially the heat-generating areas for air cooling unencapsulated train.

Furthermore, it is known that delivery unit in a multi-shell housing contribute. Here, the inner shell is used as a splash guard and security cabinet educated. The outer shell is u. a. after aesthetic Aspects. The space between each housing shells is empty and forms a cavity.

The conveyor unit is at least partially in the housing arranged and connected to supply lines. About the Supply lines are driven as well as the conveyor unit also the fluid to the delivery unit transported there as well as away from it.

Furthermore, there are generic conveyor devices known, for example in the form of vacuum cleaners that not only suck in the air as intended and further promote but also additional ones Air for cooling of the conveyor unit move and over the conveyor unit to lead. such conveyors have proven themselves there for example with a high suction power, such as. B. with complete closure the suction side, the one to be conveyed Fluids, in this case air, there is also a high cooling requirement for the delivery unit, through a high through the conveyor unit in a second, promoted separate volume flow Quantity of cooling air is covered. The conveyor unit promotes thus what is to be funded Fluid in a first volume flow and also the cooling air in a second volume flow.

A disadvantage of the known generic conveyor devices however, that is the housing are very expensive. As a rule, the housings consist of Injection molding, sheet metal or metal casting with inserted insulation materials, into which the conveyor unit inserted and with the housing is screwed. about the conveyor unit becomes a cover usually to the outside encapsulated to a certain extent soundproofing to reach. The assembly is complicated and time-consuming. In addition, the weight of such housings is very high and the sound insulation only insufficient.

From the DE 91 16 755.8 U1 a housing of a device is known which holds several components forming the device. A two-part carrier unit made of plastic has cutouts, which are each adapted to the external shape of the components. The components are held in a form-fitting manner in the carrier unit without the need for fastening elements. In addition, the components are enclosed by the carrier unit when they are used therein. The carrier unit is made of plastic, which is manufactured by compression molding. This housing, specially developed for computers, forms cooling lines for the components inserted into the housing.

Furthermore, from the unpublished German patent application DE 101 32 494.4 known to treat foam particles in pourable form so that the foam particles with a closed-cell structure are evacuated in an evacuated environment so that a volume reduction occurs temporarily under ambient pressure. The foam particles are then introduced into a mold in which the foam particles then return to their original outer shape in a non-evacuated environment and form a compact unit in cooperation with the mold. This process offers a wide range of options for the design of components.

The invention is based on the object Förderangregat according to the in The preamble of claim 1 to further develop the type specified that a simple assembly while avoiding the disadvantages mentioned with satisfactory sound insulation allows becomes.

This task is characterized by the Features of claim 1 in connection with its preamble features solved.

The subclaims form advantageous developments the invention.

The invention is based on the knowledge that the conveying unit of a conveying device, which is cooled by a fluid which is fed to the conveying unit for cooling, can be encapsulated in a simple manner by a housing which is formed by pouring, pouring, foaming or similar processes filling material around the conveying unit. On the one hand, this ensures that the housing completely encapsulates the sound-producing delivery unit and, on the other hand, that simple installation is ensured by inserting the delivery unit into the molding unit and then lining it with filler material or by inserting it into preformed filler material.

According to the invention that is delivery unit as an insert in filling material form-fitting tight arranged and through the filling material outward encapsulated enclosed, at least the filling material, the housing or part of the housing forms.

This also allows a variety of shapes reach, for example, to make the housing pleasing, or supply lines within of the housing functionally.

Certain mechanical, especially external, loads can require that at least one layer be the outer and / or inner side of the filling material surrounds. The layer can be made of plastic, fabric or metal consist. The outer layer can also made by injection molding and the remaining interior space between delivery unit with supply lines and the outer layer with filling material filled out his.

Because the housing, which by promoting the to be promoted Fluids develop heat depending on the power, but the housing the conveyor unit Completely encloses and therefore no heat dissipation by air division is easily possible, the cooling of the delivery unit special attention should be paid.

According to one embodiment of the invention hence what is to be funded Fluid at least in regions to cool the conveyor unit around it guided and forms the cooling medium. This has the advantage that this is to be funded Fluid warmed becomes. For example, in the case of a high-pressure pump for cleaning purposes the warming of the to be promoted Fluids achieved better cleaning performance.

Here, the housing has a Inlet and an outlet opening on and the conveyor unit is over Supply lines connected to these openings. To optimize cooling of the conveyor unit encompass the supply lines, for example in certain areas meandering, the conveyor unit.

According to one embodiment encompasses only that of the inlet opening to the conveyor unit running supply line in some areas the conveyor unit, what the cooling area corresponds to the supply line. This has the advantage that to be funded Fluid through the cooling of the conveyor unit heated and also the supply lines, for example at a Compressor, can be easily trained as this is the low pressure area of the compressor. For example, at least the cooling area the supply line can be integrated into the housing of the conveyor unit, which further simplifies manufacture and assembly. It also will also the cooling optimized.

The conveyor unit can be electrical operated and for example with a fuel cell or interact with a battery. Complementary or alternative to this a power line arranged as a further supply line in the housing, via the the electrically operated conveyor unit can be connected to a voltage source.

The conveyor unit can also operated by an internal combustion engine. As above has been addressed, the conveyor unit a pump, a compressor, a suction device or the like his.

In order to simplify maintenance, in particular, the housing is divided in such a way that the conveyor unit can be replaced. In the operating state, however, the two housing parts are firmly connected to one another, in particular in a sealing manner. This ensures that the sound insulation is maintained and the delivery unit, for. B. is protected from moisture. This could best be done through a procedure according to the DE 91 16 775.8 U1 or the DE 101 32 494.4 be guaranteed.

It is advantageous if the delivery unit is through the housing Is air and / or watertight encapsulated, because here on the one hand soundproofing best guaranteed the protection of the conveyor unit from external influences is optimized is.

The fluid to be pumped can, for example, be water or be air.

According to one embodiment the invention is the housing, that the conveyor unit endures completely Made of plastic and provided with recesses that the Conveyor unit and enclose the supply lines in a positive manner. The delivery unit and the supply lines are through a positive connection fixed by the plastic without any fasteners, such as screws, bolts, clamps, snap connections or others Connection techniques, such as welding, soldering, gluing, are required. Assembly of the conveyor is done by inserting the conveyor unit with its supply lines in filler material. The weight of the housing is opposite usual housings significantly reduced. Good acoustic insulation is also achieved.

The conveyor device according to the invention can be manufactured as follows:
The conveyor unit is placed in a mold and then clad with filling material. Alternatively, the conveyor unit is placed in prefabricated forms made of filling material, which were previously produced. The shapes have the negative shape of the conveyor unit. Both times, the conveyor unit is fixedly inserted as an insert in the filling material and encapsulated by the filling material to the outside.

In a preferred embodiment of the invention, the housing is manufactured in a quick and inexpensive manner by compression molding from plastic material, which can be foamed, for example, in a molding tool. In this context, the DE 91 16 755.8 U1 made the subject of this disclosure in connection with the design of the housing for the För dervorrichtung. In this way, all recesses for receiving the conveyor unit and the supply lines can be formed in a single step.

To charge the case too avoid, the plastic is sufficiently conductive. In addition, the plastic a density of approximately 10 up to 300 g / l, in particular 40 to 80 g / l for compression molding.

A particularly suitable plastic as filling material is expanded polypropylene. It is a lightweight material, can can be easily molded in different forms, is shock absorbing and still has dimensional stability. Furthermore, polypropylene is temperature stable and chemically resistant. Further can do it completely can be reused and is therefore from the point of view of environmental protection forth advantageous.

Alternatively or in addition to this can also be polyurethane and polyethylene or polystyrene be used.

According to a further embodiment becomes the housing not only made by compression molding, but can be supplementary or alternatively, be made so that foam particles first be evacuated in an evacuated environment so that it can then be an evacuated environment can be reduced in volume. Then these foam particles are placed in a mold for example in an outer layer produced by means of an injection molding process or in a foil designed in a mold or in a deep-drawn Foil in which the foam particles are then not evacuated Environment towards their original external form Reset. By a deferred reset due to the closed-cell structure of the foam particles in the direction their original outer shape the reduced foam particles can be easily removed into a form in which they gradually move towards their original external form Reset.

With the resetting a static one is created Unit from the deferred Foam particles in cooperation with the foam particles surrounding film or shape and the conveyor unit. The conveyor unit, that is surrounded by the foam particles is due to the restoring force the foam particles held. This positive and positive connection can be easily solved again, so that this static unit consists of the form, the conveyor unit and the foam particles can be separated again. This is particularly with regard to the recyclability of this conveyor advantageous.

In this context, the German patent application DE 101 32 494.4 referenced, which is made for disclosure in connection with the formation of the housing for the conveyor.

Other advantages and features of Invention emerge from the following description of two embodiments in connection with the drawing. Show it:

1 a perspective view with partial section of the conveyor device according to a first embodiment of the invention;

2 a perspective view with partial section of a conveyor assembly of the conveyor of 1 ;

3 a cross-sectional perspective view of the conveyor of FIG 1 ;

4 a cross-sectional perspective view of the conveyor of FIG 1 but with one in relation to 3 alternative housing design;

5 a perspective view with partial section of the conveyor device according to a second embodiment of the invention;

6 a perspective view with partial section of a conveyor assembly of the conveyor of 5 ;

7 a perspective view of the conveyor unit of 6 in a mold during the manufacture of the housing of the conveyor; and

8th a cross-sectional perspective view of the conveyor of FIG 5 ,

In the 1 to 3 is a first embodiment of a conveyor in the form of a pressure washer 10 shown. The pressure washer 10 includes a housing 12 with a high pressure pump 14 that are inside the case 12 is firmly arranged. A first supply line 16 leads a fluid to be conveyed from an inlet 18 to the high pressure pump 14 , The inlet connection 18 is connected to a line connected to a fluid source, not shown here. From the high pressure pump 14 runs a second supply line 20 to a drain connector 22 , On the drain connector 22 a high-pressure line is connected, which interacts with a cleaning gun, not shown here, with an outlet nozzle.

With the high pressure pump 14 it is a conventional electrically operated high pressure pump that has an electric motor 24 having. To the electric motor 24 is a cable as a third supply line 26 connected, which can be connected to a voltage source, not shown here.

Via the first supply line 16 water in the low pressure area becomes a high pressure pump 14 promoted by this. In the area of the electric motor 24 the high pressure pump 14 runs the supply line 16 about the perimeter of the case 28 of the electric motor 24 meandering until it finally comes into the high-pressure pump at the inlet opening marked with 30 14 entry. The electric motor 24 is part of the high pressure pump 14 - in relation to 2 right - the being in relation to 2 area of the high pressure pump on the left 14 the pump area 32 forms.

Due to the meandering course of the supply line 16 about the scope of the electric motor 24 becomes a cooling area 34 educated. By flowing through the cooling area 34 with water in the pump area 32 from the high pressure pump 14 is pressurized and conveyed for cleaning purposes, heat becomes the electric motor 24 withdrawn and thus cooled.

In the cooling area 34 is the supply line 26 into the outer wall of the housing 28 of the electric motor 24 integrated. This is the partial sectional view of 2 can be seen clearly, with the arrows 36 the course of the supply line 16 in the cooling area 34 is illustrated by partial section.

After the water to be pumped the first supply line 16 , especially the cooling area 34 , happens and through the inlet opening 30 in the pump area 32 has penetrated, it is put under high pressure and via the second supply line 20 in the on the drain pipe 22 Connected high pressure line promoted and applied in a predetermined manner via the spray gun with a corresponding outlet nozzle.

In 3 and 4 are in the outer shell of the housing 28 of the electric motor 24 introduced cooling area of the supply line 16 and the stator 38 of the electric motor 24 to recognize.

The high pressure pump 14 with the supply lines 16 . 20 and 26 as well as the inlet 18 and the drain nozzle 22 is placed according to an embodiment of the inven tion as an insert in a mold. The molding tool delimits, for example, the end contour of the housing 12 forming outer shape. The mold with the high pressure pump 14 is then foamed with a reaction foam.

As an alternative to the molding tool, a film can be used that has an outer layer 40 of the housing 12 forms. The high pressure pump is in this film 14 introduced and foam particles are introduced, which are evacuated in an evacuated environment so that their volume was reduced under ambient pressure. The reduced volume of the foam particles are poured into the film. Care is taken to ensure that the high-pressure pump is adequately reduced in size of foam particles 14 evenly surround. For this purpose, spacers or the like can be introduced into the mold, for example.

Depending on how much the foam particles were reduced by evacuation and depending on how high the desired surface pressure on the outer layer 40 of the housing 12 as well as the high pressure pump 14 with the supply lines 16 . 20 and 26 should fail, the housing 12 or the outer layer 40 of the housing 12 forming film filled with reduced foam particles. The foam particles now gradually return to their original outer shape due to the non-evacuated environment. This gradually creates an intimate bond of foam particles, so that the high pressure pump 14 inside the outer layer 40 of the housing 12 safe through the one filler 42 forming foam particles is stored and fixed. The high pressure pump 14 is dampened by the foam particles against vibrations, by the hermetic encapsulation of the high pressure pump 14 protected from moisture and especially the noise-emitting parts, such as the electric motor 24 , soundproofed. The film is then completely closed, for example welded.

The combination of foam particles loosely pressed together, that is, the filling material, makes it easy 42 , with the high pressure pump 14 and with the outer layer delimiting the outer shape 40 the housing 12 created in which then the high pressure pump 14 with the supply lines 16 . 20 . 26 is safely arranged. In addition, the composite of the foam particles with one another creates excellent sound insulation and shock absorption.

The cooling problem is solved by the appropriately designed cooling area described above, which has an additional effect on the high-pressure cleaner 10 shows that namely, hot / hot water emerges from the outlet nozzle of the spray gun, not shown here. This further increases the cleaning effect of the high-pressure cleaner.

The filling material 42 Forming foam particles consist of plastic.

The foam particles have a closed-cell structure, ie the many gas cells in the foam are self-contained. The gas diffuses out of the cells through the vacuum. The volume of the foam particles is then below Ambient pressure reduced. The closed-cell structure ensures that the foam particles do not immediately revert to their original position, but gradually revert to their original shape over a period of time. The gas first has to diffuse back into the cells. This guarantees the delayed reshaping. The closed-cell structure thus acts like a choke.

In particular, the foam particles are formed by an elastic foam, for example expanded polypropylene, expanded polyethylene, expanded polystyrene and / or expanded polyurethane. In this case, only the elastically deformable foam particles could be evacuated and the non-evacuated foam particles added later. This has the advantage that the foam particles can be easily produced using known methods. Appropriate mixing ratios of different foam particle materials after evacuation on the one hand and material selection for the outer layer on the other hand allow properties of the unit made of foam particles and the outer layer and thus the housing 12 just set.

As foam particles are before used all those that have a bulk density before evacuation of approximately 10 to 300 g / l, in particular 20 to 40 g / l.

The foam particles thus form the filling material 42 by the high pressure pump 14 is positively arranged and is encapsulated by the filling material to the outside. The filling material 42 forms together with the outer layer 40 the housing 12 ,

In 4 is an alternative embodiment of a housing 12 the in the 1 to 3 shown high pressure cleaner 10 shown. This housing 12 consists essentially of two parts 44 and 46 , both of which are also made of plastic as filling material. The plastic is foam particles connected to one another by compression molding. The plastic can be expanded polypropylene, a material that can be easily molded into different shapes. It is also shock absorbing and still has dimensional stability. Furthermore, polypropylene is temperature stable and chemically resistant. In compression molding, the individual foam particles are connected to one another by sintering, i.e. by pressure and the influence of heat. Such a material is known as EPP, namely expanded PP.

Without further ado, it is also possible to use a combination of the 1 to 3 described housing manufacture and based on the 4 to use described housing manufacture. For example, sections of the housing 12 the pressure washer 10 Made of compression molded plastic, whereas other parts were made using the evacuated and resettable foam particles. Ultimately, it is a question of expediency which design is preferable. In particular with a view to possible maintenance within the housing 12 arranged high pressure pump 14 one or the other solution may be more beneficial.

In the 5 to 8th is another embodiment of a pump 48 shown. The high pressure pump 48 is similar to that in the 1 to 5 high pressure pump shown 14 constructed and has the same reference numerals for the same parts.

The difference is as follows: there are two cycles. On the one hand, the fluid to be pumped, in this case water, from the inlet connection 18 via the first supply line 16 to the high pressure pump 14 led, pressurized there and then on via the second supply line 20 to the drain connector 22 promoted. In addition, a cooling medium, namely air, from an inlet opening 50 via a fourth supply line 52 the electric motor 24 fed. Via a fifth supply line 54 the cooling medium becomes the outlet opening 56 guided. The one from the inlet opening 50 , fourth supply line 52 , fifth supply line 54 and outlet opening 56 existing cooling circuit passes the electric motor 24 and pulls the electric motor 24 Heat. Otherwise, the case 12 constructed according to the previously described design.

In 7 a possible manufacturing process is clarified again. In a mold 58 becomes the delivery unit in the manner of the high pressure pump 48 brought in. The inlet opening 50 , the exhaust port 56 as well as the inlet connection 18 and the drain nozzle 22 point in the mold 58 corresponding recesses on, causing the high pressure pump 48 first in the mold 58 is fixed. Then in particular with an outer layer 40 lined mold 58 Foam particles, as described using the first embodiment, or any type of reaction foam introduced The invention is characterized in that a lightweight, shock-absorbing, sound-absorbing and easy to manufacture housing is made possible by the specified construction and the manufacturing process. The possibility of automating the insertion of the conveyor by means of handling devices simply eliminates the actual device assembly.

10

high pressure cleaner

12

casing

14

high pressure pump

16

first supply line

18

Intake support

20

second supply line

22

drain connection

24

electric motor

26

third supply line

28

casing

30

inlet opening

32

pump area

34

cooling area

36

arrows

38

stator

40

Outer layer Outer shell, foil

42

filling material

44

first housing part

46

second housing part

48

high pressure pump

50

inlet port

52

fourth supply line

54

fifth supply line

56

outlet

58

mold

Claims (25)

Conveyor ( 10 ) for conveying a fluid, with a fluid-conveying unit ( 14 ), which is cooled by a fluid that flows to the conveyor unit ( 14 ) is appropriately supplied for cooling, and a housing ( 12 ) in which the conveyor unit ( 14 ) with supply lines ( 16 . 20 . 26 ) is arranged, the conveyor unit ( 14 ) at least the fluid to be pumped as well as a cooling fluid for cooling the pumping unit ( 14 ) promotes, characterized in that the conveyor unit ( 14 ) as an insert in filling material ( 42 ) positively arranged and through the filling material ( 42 ) is encapsulated to the outside, with at least the filling material ( 42 ) the housing ( 12 ) or part of the housing ( 12 ) forms. Conveying device according to claim 1, characterized in that at least one layer ( 40 ) the outer side the filling material ( 42 ) surrounds. Conveying device according to claim 2, characterized in that the layer ( 40 ) consists of plastic, fabric or metal. Conveying device according to claim 2 or 3, characterized in that the outer layer ( 40 ) is made by injection molding. Conveying device according to one of the preceding claims, characterized in that the fluid to be conveyed at least in regions for cooling the conveying unit ( 14 ) is guided around it and forms the cooling medium. Conveying device according to one of the preceding claims, characterized in that the housing ( 12 ) an inlet opening ( 18 ) and a drain opening ( 22 ) and the conveyor unit ( 14 ) via supply lines ( 16 . 20 ) with these openings ( 18 . 22 ) connected is. Conveying device according to claim 5 and 6, characterized in that the supply lines ( 18 . 20 ) the conveyor unit meandering in some areas ( 14 ) embraces. Conveying device according to claim 7, characterized in that only that of the inlet opening ( 18 ) to the conveyor unit ( 14 ) running supply line ( 16 ) the conveyor unit in some areas ( 14 ) embraces - cooling area ( 34 ) the supply line ( 16 ). Conveying device according to claim 7 or 8, characterized in that at least the cooling area ( 34 ) the supply line ( 16 ) in the housing ( 12 ) of the conveyor unit ( 14 ) is integrated. Conveying device according to one of the preceding claims, characterized in that the conveying unit ( 14 ) is electrically operated. Conveying device according to claim 10, characterized in that the conveying unit ( 14 ) interacts with a fuel cell and / or a battery. Conveying device according to claim 10 or 11, characterized in that a network line as a further supply line ( 26 ) in the housing ( 12 ) is arranged. Conveying device according to one of the preceding claims, characterized in that the conveying unit ( 14 ) is a pump, a compressor, a suction device or the like. Conveying device according to one of the preceding claims, characterized in that the housing ( 12 ) is divided so that an exchange of the conveyor unit ( 14 ) is possible, whereby the parts ( 42 . 44 ) of the housing ( 12 ) are firmly connected to one another in the operating state, in particular in a sealing manner. Conveying device according to one of the preceding claims, characterized in that the conveying unit ( 14 ) is operated by an internal combustion engine. Conveyor device according to one of the preceding existing claims, characterized in that the conveyor unit ( 14 ) through the housing ( 12 ) is encapsulated airtight and / or watertight. conveyor according to one of the preceding claims, characterized in that that that is to be promoted Fluid is water or air. Conveying device according to one of the preceding claims, characterized in that the filling material ( 42 ) Includes plastic. conveyor according to claim 18, characterized in that the plastic is sufficient conductive to avoid charging conveyor according to claim 18 or 19, characterized in that the plastic a density of approximately 10-300 g / l, especially 40-80g / l Has. conveyor according to one of claims 18 to 20, characterized in that at least part of the plastic through expanded polypropylene, through expanded polyethylene, through expanded polystyrene and / or through expanded polyurethane is formed. conveyor according to one of claims 18 to 21, characterized in that the plastic in pourable form the present foam particle is converted into a housing shape. Conveying device according to one of claims 18 to 22, characterized in that the housing ( 12 ) or parts of the housing ( 12 ) is / are manufactured by compression molding. Conveying device according to claim 22 and in particular conveying device according to claim 23, characterized in that the filling material ( 42 ) plastic was treated at least in some areas according to the method according to German patent application 101 32 494.4-16 in the housing ( 12 ) is present. Conveying device according to claim 24, characterized in that an outer casing ( 40 ) of the housing ( 12 ) and / or parts of the housing ( 12 ) corresponds to a shape for foam particles present in pourable form.